Figure 4 : Performance enhancement of FLV-MoS2 by 5 nm of catalysts of Cu or Au.

From: Rapid water disinfection using vertically aligned MoS2 nanofilms and visible light

Figure 4

a, TEM images (top view) show the morphology of Cu–MoS2 and Au–MoS2 after deposition. b, XPS characterization of Cu–MoS2 and Au–MoS2 shows the presence of Cu and Au. c, Schematic that shows the enhancement of electron–hole separation to facilitate the electrons to participate in ROS-generation reactions after Cu/Au deposition. d, Disinfection-performance comparison of Cu–MoS2 and Au-MoS2 with pristine FLV-MoS2 shows the rapid disinfection by Cu–MoS2 and Au–MoS2 after deposition of the catalysts. e, Disinfection-performance comparison of Cu–MoS2 with the literature values of other photocatalysts using E. coli. The plot shows the log inactivation of E. coli with respect to illumination time for all the photocatalysts in the comparison: (1) Cu–MoS2 (this work, 2 cm2 film equivalent to 1.6 mg l–1), (2) TiO2–CdS (ref. 25) (1 cm2 film), (3) ZnO/Cu (ref. 48) (100 mg l–1), (4) GO–CdS (ref. 34) (100 mg l–1), (5) BV (ref. 36) (100 mg l–1), (6) GO–C3N4 (ref. 37) (100 mg l–1) and (7) SGO–ZnO–Ag (ref. 35) (100 mg l–1). Details of the conditions for the photocatalytic-disinfection experiments (sample concentration, light source and intensity, and bacteria strain) are given in Supplementary Table 1. The final inactivation efficiencies are limited by the initial bacterial concentration. NA, not available.